Arsenal came into Sunday's game against Chelsea with a sense of optimism.
The Gunners would go back to the top of the table with a win, while Chelsea have been struggling through their worst season since Roman Abramovich arrived over a decade ago.
But that optimism quickly turned to misery after their worst fears were realised in a chaotic first half performance.
First, Per Mertesacker was given a straight red card for a last-man challenge on Diego Costa with just 18 minutes gone.
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Arsene Wenger needed to bring on Gabriel Paulista, which meant someone had to make way.
In the end, that man was Olivier Giroud, and Arsenal fans weren't happy to see their main striker leave the pitch after just 20 minutes, with a chorus of boos ringing round the Emirates.
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Then Costa heaped the misery on the home fans as he tucked away a cross ahead of three Arsenal defenders.
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